EP0484841B1 - Extrusion die for manufacturing flat webs of thermoplastic material - Google Patents
Extrusion die for manufacturing flat webs of thermoplastic material Download PDFInfo
- Publication number
- EP0484841B1 EP0484841B1 EP91118712A EP91118712A EP0484841B1 EP 0484841 B1 EP0484841 B1 EP 0484841B1 EP 91118712 A EP91118712 A EP 91118712A EP 91118712 A EP91118712 A EP 91118712A EP 0484841 B1 EP0484841 B1 EP 0484841B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- extrusion die
- thickness
- distance
- lips
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 18
- 239000012815 thermoplastic material Substances 0.000 title description 4
- 238000004519 manufacturing process Methods 0.000 title description 2
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 7
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000000155 melt Substances 0.000 description 14
- 239000000428 dust Substances 0.000 description 12
- 238000009825 accumulation Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
- B29C48/313—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections by positioning the die lips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
Definitions
- the invention relates to an extrusion die for producing flat webs of greater thickness from thermoplastic material; they are also referred to as wide slot nozzles.
- slot dies without a dust bar, but with elastic exit lips, so-called “flex lips", are used. Thanks to their elasticity, the thickness of the flow channel of the thermoplastic melt from the distribution channel to the outlet lips can be changed by up to about half a millimeter. A plurality of set screws or thermal expansion bolts, which act on the elastic lip, are used for this. If the extruded film web is less than 2 mm thick, an adjustment stroke of half a millimeter is sufficient to regulate the melt flow at the outlet lips and to compensate for any irregularities in the transverse direction.
- a film nozzle of this type is known from NL-A 68 05041. To avoid deposits of the molding compound on the nozzle lips, these are slightly widened directly at the mouth. This expansion is evidently on the order of a fraction of a millimeter and has no discernible influence on the thickness of the extruded film.
- the actuating force is allowed to act on the elastic lip via a plurality of movably arranged slats. This enables better fine adjustment, for example for bead size adjustment on a subsequent roller smoothing unit, but the actuating stroke remains in a range which is adapted to the extrusion of thin film webs.
- wide slot dies with dust bars are generally used. This is understood to mean a bar protruding between the distribution channel and the outlet lips into the stowage area of the nozzle, which bar is arranged so as to be displaceable in a groove and can be sunk into the melt flow to different depths by suitable adjusting means. In this way, melt flows of considerable thickness can also be regulated.
- the object of the invention is to provide an extrusion die with which flat sheets of greater thickness made of thermoplastic material can also be produced without the disadvantages associated with the use of a dust bar.
- the thickness D of the storage area is 1 to 4 mm and the shaping distance A of the outlet lips (4, 5) is 3 to 40 mm.
- the distance A of the exit lips is more than two to ten times larger than the thickness D of the storage area.
- the accumulation area 6 has such a small thickness D that the actuating stroke of the elastic lip 7 is sufficient to control and fine-tune the melt flow.
- the melt emerging from the accumulation area 6 collects in the area of the exit lips and the thickness of the strand increases to the desired thickness A.
- the speed of the strand decreases inversely as the strand thickness increases.
- a dust bar is no longer required to control the melt flow and is preferably not present. This eliminates all the disadvantages associated with the jam bar.
- the higher flexibility of the lip 7 allows a much finer control of the melt flow in narrowly limited width ranges than would be possible with a dust bar.
- the pressure loss after leaving the accumulation area 6 is so small that cross flows which could impair the uniformity of the melt flow do not occur. This is particularly true when the downstream end of the stowage area is no more than twice the distance A from the outlet lips 4, 5.
- melt flow In the entire flow area of the nozzle 1, the melt flows on smooth, unbroken walls, so that there are neither dead spots nor leaks. Melt deflections, as are common on nozzles with dust sheets, are not necessary. This simplifies the construction of the nozzle and reduces the pressure loss in the melt flow.
- the thickness D in the storage area is preferably 1 to 2 mm.
- the distance A of the outlet lips 4,5 can optionally also be more than 3 to 40 mm.
- the angle of inclination of step 11 against the opposite wall can be 15 to 60 °.
- the opposite walls of the flow channel should run parallel.
- the length of the parallel exit area (measured in the direction of flow) is generally smaller than the distance A of the exit lips. In the extreme case, the parallel area can be completely absent, so that the exit area is divergent.
- the length of the storage area 6 can be, for example, 10 to 100 mm. If the distribution channel 3 is curved, as usual, the stowage area begins at the end of the distribution channel closest to the lips 4, 5.
- the length of the elastic lip 7 is dimensioned so that it allows an adjustment stroke of up to 0.5 mm without permanent deformation. The fine adjustment is usually facilitated if the elastic lip 7 to the exit lip 5 has approximately the same thickness and the actuating force from the actuators 8 according to the teaching of German utility model G 88 13 801 is introduced by means of movable slats 9. However, a variation of the lip thickness could be advantageous for special applications.
- the actuators 8, e.g. Adjusting bolts, thermal expansion bolts or piezotranslators preferably act on an elastic steel band 10. The closer the actuators 8 are arranged and the narrower the fins 9 are, the more finely adjustable the nozzle is.
- the actuators 8 are preferably arranged at lateral distances of not more than 40 mm and the lamellae 1 to 5 mm thick.
- extruded strands up to 15 mm thick can be further treated on a conventional roller smoothing unit, the fine regulatability of the nozzle according to the invention having an advantageous effect in the bead regulation on the first roller nip.
- Thicker strands can be taken over by an endless conveyor belt and passed through a cooling zone on this.
- the new extrusion die can be used to extrude all kinds of thermoplastics that are suitable for the production of flat sheets of medium to large thickness. Examples include PMMA, PC, PVC, PS, polyolefins, PA, PES, PEEK.
- the plastic melt is fed into the inlet channel 2 from an extruder (not shown in the drawing). If a suitable adapter is used in front of the inlet channel 2, different plastics can also be coextruded into multilayered webs.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft eine Extrusionsdüse zur Herstellung flacher Bahnen größerer Dicke aus thermoplastischem Kunststoff; sie werden auch als Breitschlitzdüsen bezeichent.The invention relates to an extrusion die for producing flat webs of greater thickness from thermoplastic material; they are also referred to as wide slot nozzles.
Zur Extrusion dünner Folien werden Breitschlitzdüsen ohne Staubalken, jedoch mit elastischen Austrittslippen, sog. "Flexlippen", verwendet. Durch ihre Elastizität lassen sie eine Dickenveränderung des Strömungskanals der thermoplastischen Kunststoffschmelze vom Verteilerkanal bis zu den Austrittslippen um bis zu etwa einem halben Millimeter zu. Man verwendet dazu eine Mehrzahl von Stellschrauben oder thermischen Dehnbolzen, die auf die elastische Lippe einwirken. Bei einer Dicke der extrudierten Folienbahn unter 2 mm reicht ein Stellhub von einem halben Millimeter aus, um die Schmelzeströmung an den Austrittslippen zu regulieren und eventuelle Ungleichmäßigkeiten in Querrichtung auszugleichen.For the extrusion of thin films, slot dies without a dust bar, but with elastic exit lips, so-called "flex lips", are used. Thanks to their elasticity, the thickness of the flow channel of the thermoplastic melt from the distribution channel to the outlet lips can be changed by up to about half a millimeter. A plurality of set screws or thermal expansion bolts, which act on the elastic lip, are used for this. If the extruded film web is less than 2 mm thick, an adjustment stroke of half a millimeter is sufficient to regulate the melt flow at the outlet lips and to compensate for any irregularities in the transverse direction.
Eine Foliendüse dieser Art ist aus NL-A 68 05041 bekannt. Zur Vermeidung von Ansetzungen der Formmasse an den Düsenlippen sind diese unmittelbar an der Mündung geringfügig erweitert. Diese Erweiterung liegt erkennbar in einer Größenordnung von Bruchteilen eines Millimeters und hat keinen feststellbaren Einfluß auf die Dicke der extrudierten Folie.A film nozzle of this type is known from NL-A 68 05041. To avoid deposits of the molding compound on the nozzle lips, these are slightly widened directly at the mouth. This expansion is evidently on the order of a fraction of a millimeter and has no discernible influence on the thickness of the extruded film.
Gemäß dem deutschen Gebrauchsmuster G 88 13 801 läßt man die Stellkraft über eine Mehrzahl von beweglich angeordneten Lamellen auf die elastische Lippe einwirken. Dadurch wird eine bessere Feineinstellung, beispielsweise zur Wulstgrößeneinstellung an einem nachfolgenden Walzenglättwerk möglich, jedoch bleibt der Stellhub in einer Größenordnung, die der Extrusion von dünnen Folienbahnen angepaßt ist.According to the German utility model G 88 13 801, the actuating force is allowed to act on the elastic lip via a plurality of movably arranged slats. This enables better fine adjustment, for example for bead size adjustment on a subsequent roller smoothing unit, but the actuating stroke remains in a range which is adapted to the extrusion of thin film webs.
Zur Extrusion von thermoplastischen Kunststoffen zu Plattenbahnen mit einer Dicke von mehr als 2 mm werden im allgemeinen Breitschlitzdüsen mit Staubalken verwendet. Man versteht darunter einen zwischen dem Verteilerkanal und den Austrittslippen in den Staubereich der Düse hineinragenden Balken, der in einer Nut verschiebbar angeordnet ist und durch geeignete Stellmittel unterschiedlich tief in den Schmelzestrom eingesenkt werden kann. Auf diese Weise lassen sich auch Schmelzeströme von erheblicher Dicke regulieren.For the extrusion of thermoplastic materials into sheet webs with a thickness of more than 2 mm, wide slot dies with dust bars are generally used. This is understood to mean a bar protruding between the distribution channel and the outlet lips into the stowage area of the nozzle, which bar is arranged so as to be displaceable in a groove and can be sunk into the melt flow to different depths by suitable adjusting means. In this way, melt flows of considerable thickness can also be regulated.
Mit der Anwendung eines Staubalkens ist eine Reihe von Nachteilen verbunden. Er muß gesondert hergestellt und in die dafür vorgesehene Nut genau eingepaßt werden. Das Eindringen der Kunststoffschmelze in den Spalt zwischen der Nutwandung und dem Staubalken muß durch Dichtungsstreifen verhindert werden, was wegen der schwer erfüllbaren Materialanforderungen an das Dichtungsmittel nur bedingt möglich ist. Aus konstruktiven Gründen muß der Staubalken in einem erheblichen Abstand von den Düsenlippen liegen, wo die Schmelze noch unter einem sehr hohen Druck steht. Er muß deshalb sehr steif ausgelegt werden, so daß er zu einer Feinsteuerung über die Düsenbreite nur bedingt geeignet ist. Die erforderlichen Stellkräfte sind erheblich. Der starke Druckabfall der Schmelze vom Bereich des Staubalkens bis zu den Austrittslippen kann zu Querströmungen Anlaß geben, wodurch die ausgleichende Wirkung des Staubalkens teilweise wieder zunichte wird. Weiterhin sind sog. Totstellen im Schmelzekanal am Anfang und am Ende des Staubalkens schwer zu vermeiden. Dadurch können Anteile der Schmelze aufgehalten und erst nach Beginn einer thermischen Zersetzung weitergeführt werden, so daß in der erzeugten Bahn Schlieren von zersetztem Material auftreten.There are a number of disadvantages to using a jam bar. It must be manufactured separately and fitted exactly into the groove provided. The penetration of the plastic melt into the gap between the groove wall and the dust bar must be prevented by sealing strips, which is only possible to a limited extent because of the difficult material requirements for the sealant. For constructional reasons, the dust bar must be at a considerable distance from the nozzle lips, where the melt is still under a very high pressure. It must therefore be designed to be very rigid, so that it is only of limited suitability for fine control over the width of the nozzle. The required actuating forces are considerable. The sharp drop in pressure of the melt from the area of the dust bar to the outlet lips can give rise to cross currents, as a result of which the balancing effect of the dust bar is partially nullified. Furthermore, so-called dead spots in the melt channel at the beginning and at the end of the dust bar are difficult to avoid. This allows shares the melt is stopped and only continued after thermal decomposition has started, so that streaks of decomposed material occur in the web produced.
Aufgabe der Erfindung ist die Schaffung einer Extrusionsdüse, mit der auch flache Bahnen größerer Dicke aus thermoplastischem Kunststoff ohne die Nachteile, die mit der Anwendung eines Staubalkens verbunden sind, hergestellt werden können.The object of the invention is to provide an extrusion die with which flat sheets of greater thickness made of thermoplastic material can also be produced without the disadvantages associated with the use of a dust bar.
Die gestellte Aufgabe wird erfindungsgemäß durch eine Extrusionsdüse nach Patentanspruch 1 gelöst.The object is achieved according to the invention by an extrusion die according to claim 1.
Zweck mäßige Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen 2 bis 5.Appropriate developments of the invention result from the
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.
Es zeigen
- Fig. 1
- eine Extrusionsdüse gemäß der Erfindung
und - Fig. 2
- zum Vergleich eine herkömmliche Breitschlitzdüse mit Staubalken
- Fig. 1
- an extrusion die according to the invention
and - Fig. 2
- for comparison a conventional wide slot nozzle with dust bar
Erfindungsgemäß betragen die Dicke D des Staubereichs 1 bis 4 mm und der formgebende Abstand A der Austrittslippen (4,5) 3 bis 40 mm. Der Abstand A der Austrittslippen ist mehr als zwei bis zehn mal größer als die Dicke D des Staubereichs. Es war überraschend, daß die gestellte Aufgabe durch technische Mittel lösbar war, die in ähnlicher Weise, aber zu einem ganz anderen Zweck, bisher nur bei Düsen zur Extrusion dünner Folien bekannt waren.According to the invention, the thickness D of the storage area is 1 to 4 mm and the shaping distance A of the outlet lips (4, 5) is 3 to 40 mm. The distance A of the exit lips is more than two to ten times larger than the thickness D of the storage area. It was surprising that the task set could be achieved by technical means which, in a similar way, but for a completely different purpose, were previously only known for nozzles for the extrusion of thin films.
Der Staubereich 6 hat eine so geringe Dicke D, daß der Stellhub der elastischen Lippe 7 zur Steuerung und Feinregulierung des Schmelzestromes ausreicht. Im Bereich der Austrittslippen sammelt sich die aus dem Staubereich 6 austretende Schmelze und die Dicke des Stranges nimmt auf die Sollstärke A zu. Die Geschwindigkeit des Stranges nimmt im umgekehrten Verhältnis ab, wie die Strangdicke zunimmt. Ein Staubalken ist zur Steuerung des Schmelzestromes nicht mehr erforderlich und vorzugsweise nicht vorhanden. Dadurch entfallen alle Nachteile, die mit dem Staubalken verbunden sind. Die höhere Flexibilität der Lippe 7 erlaubt eine viel feinere Steuerung des Schmelzestromes in eng begrenzten Breitenbereichen als es mit einem Staubalken möglich wäre. Der Druckverlust ist nach dem Austritt aus dem Staubereich 6 so gering, daß Querströmungen, die die Gleichmäßigkeit des Schmelzestromes beeinträchtigen könnten, nicht auftreten. Das trifft insbesondere dann zu, wenn das stromabwärtige Ende des Staubereichs nicht weiter als das Doppelte des Abstands A von den Austrittslippen 4,5 entfernt ist.The
Im gesamten Strömungsbereich der Düse 1 fließt die Schmelze an glatten, undurchbrochenen Wänden, so daß es weder Totstellen noch Undichtigkeiten geben kann. Schmelzeumlenkungen, wie an Düsen mit Staublaken gebräuchlich, sind entbehrlich. Dadurch ist der konstruktive Aufbau der Düse vereinfacht und der Druckverlust im Schmelzestrom vermindert.In the entire flow area of the nozzle 1, the melt flows on smooth, unbroken walls, so that there are neither dead spots nor leaks. Melt deflections, as are common on nozzles with dust sheets, are not necessary. This simplifies the construction of the nozzle and reduces the pressure loss in the melt flow.
Die Dicke D im Staubereich beträgt vorzugsweise 1 bis 2 mm. Der Abstand A der Austrittslippen 4,5 kann gegebenenfalls auch mehr als 3 bis 40 mm betragen. Es ist zweckmäßig, die elastische Lippe 7 bis zur formbildenden Austrittslippe 5 eben auszubilden und die Dickenzunahme am Übergang von der Stauzone 6 zur Austrittslippe 4 in Form einer geneigten Stufe 11 mit gerundeten Übergängen zu gestalten, die einen laminaren Strömungsverlauf der Schmelze begünstigt. Der Neigungswinkel der Stufe 11 gegen die gegenüberliegende Wand kann 15 bis 60° betragen. Unmittelbar vor der formbildenden Austrittslippe 4 sollten die einander gegenüberliegenden Wände des Strömungskanals parallel verlaufen. Die Länge des parallelen Austrittsbereichs (in Fließrichtung gemessen) ist in der Regel kleiner als der Abstand A der Austrittslippen. Im Extremfall kann der parallele Bereich ganz fehlen, so daß der Austrittsbereich divergent ist.The thickness D in the storage area is preferably 1 to 2 mm. The distance A of the
Die Länge des Staubereichs 6 kann z.B. 10 bis 100 mm betragen. Wenn der Verteilerkanal 3, wie üblich, bogenförmig ausgebildet ist, beginnt der Staubereich an dem den Lippen 4,5 nächstgelegenen Ende des Verteilerkanals. Die Länge der elastischen Lippe 7 wird so bemessen, daß sie einen Stellhub bis zu 0,5 mm ohne bleibende Verformung zuläßt. Die Feineinstellung wird in der Regel erleichtert, wenn die elastische Lippe 7 bis zur Austrittslippe 5 etwa die gleiche Dicke hat und die Stellkraft von den Stellgliedern 8 gemäß der Lehre des deutschen Gebrauchsmusters G 88 13 801 mittels beweglicher Lamellen 9 eingeleitet wird. Für spezielle Anwendungen könnteallerdings auch eine Variation der Lippendicke vorteilhaft sein.The length of the
Die Stellglieder 8, z.B. Stellbolzen, thermische Dehnbolzen oder Piezotranslatoren, wirken vorzugsweise auf ein elastisches Stahlband 10 ein. Je dichter die Stellglieder 8 angeordnet und je schmaler die Lamellen 9 sind, umso feiner regulierbar ist die Düse. Vorzugsweise sind die Stellglieder 8 in seitlichen Abständen nicht über 40 mm angeordnet und die Lamellen 1 bis 5 mm dick.The actuators 8, e.g. Adjusting bolts, thermal expansion bolts or piezotranslators preferably act on an
Nach dem Austritt aus den Lippen 4,5 können extrudierte Stränge bis 15 mm Dicke auf einem üblichen Walzenglättwerk weiterbehandelt werden, wobei sich die feine Regulierbarkeit der erfindungsgemäßen Düse bei der Wulstregulierung am ersten Walzenspalt vorteilhaft auswirkt. Dickere Stränge können von einem endlosen Förderband übernommen und auf diesem durch eine Kühlzone geführt werden.After exiting the
Mit der neuen Extrusionsdüse können thermoplastische Kunststoffe aller Art, die sich zur Herstellung von flachen Bahnen mittlerer bis größerer Dicke eignen, extrudiert werden. Als Beispiele seien PMMA, PC, PVC, PS, Polyolefine, PA, PES, PEEK genannt. Die Kunststoffschmelze wird aus einem (in der Zeichnung nicht dargestellten) Extruder in den Eintrittskanal 2 eingespeist. Bei Verwendung eines geeigneten Adapters vor dem Eintrittskanal 2 können auch unterschiedliche Kunststoffe zu mehrschichtigen Bahnen koextrudiert werden.The new extrusion die can be used to extrude all kinds of thermoplastics that are suitable for the production of flat sheets of medium to large thickness. Examples include PMMA, PC, PVC, PS, polyolefins, PA, PES, PEEK. The plastic melt is fed into the
Claims (5)
- An extrusion die (1) for producing thicker flat sheets made of thermoplastic plastics, comprising an inlet channel (2) for the thermoplastics plastics melt, a distribution channel (3), a pair of outlet lips (4, 5) and a baffle region (6) arranged between the distributor channel and the outlet lips, at least one wall of the baffle region (6) being in the form of a flexible lip (7) which is adjustable by adjusting means (8) in such a way that the thickness D and the distance A may be altered simultaneously by actuating the adjusting means, the thickness D of the baffle region being 1 to 4 mm and the shaping distance A between the outlet lips (4, 5) being 3 to 40 mm and the distance A being twice to ten times the thickness of D.
- An extrusion die according to claim 1, in which the outlet region has a parallel boundary over a length which is smaller than the distance A.
- An extrusion die according to claim 1 or 2, in which the outlet region is divergent.
- An extrusion die according to one or more of claims 1 to 3, in which the extrusion die (1) contains no baffle beam.
- An extrusion die according to one or more of claims 1 to 4, in which the distance of the downstream end of the baffle region from the outlet lips (4, 5) is no greater than double the distance A.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9015187U DE9015187U1 (en) | 1990-11-05 | 1990-11-05 | Extrusion nozzle for producing flat sheets of thermoplastic |
| DE9015187U | 1990-11-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0484841A1 EP0484841A1 (en) | 1992-05-13 |
| EP0484841B1 true EP0484841B1 (en) | 1995-02-22 |
Family
ID=6859044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91118712A Expired - Lifetime EP0484841B1 (en) | 1990-11-05 | 1991-11-04 | Extrusion die for manufacturing flat webs of thermoplastic material |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5273420A (en) |
| EP (1) | EP0484841B1 (en) |
| JP (1) | JP3522291B2 (en) |
| AT (1) | ATE118724T1 (en) |
| CA (1) | CA2054889C (en) |
| DE (2) | DE9015187U1 (en) |
| ES (1) | ES2070393T3 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9216548U1 (en) * | 1992-12-04 | 1993-02-04 | Röhm GmbH & Co. KG, 64293 Darmstadt | Flame-retardant noise barrier made of acrylic glass |
| DE4400069C1 (en) * | 1994-01-04 | 1995-04-06 | Heinz Dr Ing Gros | Adjustable choke with flat passage cross-section |
| DE29500803U1 (en) * | 1995-01-19 | 1995-03-02 | Röhm GmbH & Co. KG, 64293 Darmstadt | Two-channel coextrusion die |
| DE29514043U1 (en) * | 1995-09-01 | 1995-11-30 | Röhm GmbH, 64293 Darmstadt | Extrusion nozzle with adjustable shaft membrane |
| US5770129A (en) * | 1995-12-22 | 1998-06-23 | Honeywell Measurex Devron, Inc. | Apparatus and method for controlling mass flow in an extrusion die |
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| DE19732281C2 (en) * | 1997-07-26 | 1999-09-16 | Roehm Gmbh | Device for measuring the average web thickness of multi-wall sheets |
| US6206680B1 (en) | 1998-03-17 | 2001-03-27 | Extrusion Dies, Inc. | Extrusion die membrane |
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| BE1018382A3 (en) * | 2008-12-22 | 2010-09-07 | Wybo Carlos | UPHOLSTERY PANEL. |
| DE102009027431A1 (en) | 2009-07-02 | 2011-01-05 | Evonik Degussa Gmbh | Fluorescence conversion solar cell - Production by extrusion or coextrusion |
| DE102010028180A1 (en) | 2010-04-26 | 2011-10-27 | Evonik Röhm Gmbh | Plastic molding useful for manufacturing solar panels, comprises polymethyl(meth)acrylate coated with a film made of several individual layers, which are dyed with a fluorescent dye |
| US10272609B2 (en) * | 2016-09-26 | 2019-04-30 | Nordson Corporation | Extrusion die having thermally responsive lip adjustment assembly |
| CN108819171A (en) * | 2018-06-26 | 2018-11-16 | 昆山新留森模具制造有限公司 | A kind of novel SPC floor mold |
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| FR1568124A (en) * | 1968-02-13 | 1969-05-23 | ||
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-
1990
- 1990-11-05 DE DE9015187U patent/DE9015187U1/en not_active Expired - Lifetime
-
1991
- 1991-10-29 JP JP28242091A patent/JP3522291B2/en not_active Expired - Lifetime
- 1991-11-04 ES ES91118712T patent/ES2070393T3/en not_active Expired - Lifetime
- 1991-11-04 DE DE59104685T patent/DE59104685D1/en not_active Expired - Lifetime
- 1991-11-04 AT AT91118712T patent/ATE118724T1/en not_active IP Right Cessation
- 1991-11-04 EP EP91118712A patent/EP0484841B1/en not_active Expired - Lifetime
- 1991-11-04 CA CA002054889A patent/CA2054889C/en not_active Expired - Lifetime
- 1991-11-05 US US07/787,933 patent/US5273420A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2054889C (en) | 1998-08-11 |
| JP3522291B2 (en) | 2004-04-26 |
| JPH04267120A (en) | 1992-09-22 |
| ES2070393T3 (en) | 1995-06-01 |
| US5273420A (en) | 1993-12-28 |
| CA2054889A1 (en) | 1992-05-06 |
| EP0484841A1 (en) | 1992-05-13 |
| DE59104685D1 (en) | 1995-03-30 |
| ATE118724T1 (en) | 1995-03-15 |
| DE9015187U1 (en) | 1992-03-05 |
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